HFBR-2119T Просмотр технического описания (PDF) - HP => Agilent Technologies

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HFBR-2119T

Fiber Optic Transmitter and Receiver Data Links for 266 MBd

HP => Agilent Technologies 

Notes:

1. This is the maximum voltage that can

be applied across the Differential

Transmitter Data Inputs to prevent

damage to the input ESD protection

circuit.

2. When component testing these

products, do not short the receiver

Data or Signal Detect outputs directly

to ground to avoid damage to the

part.

3. The outputs are terminated with 50 Ω

connected to VCC - 2 V.

4. The power supply current needed to

operate the transmitter is provided to

differential ECL circuitry. This

circuitry maintains a nearly constant

current flow from the power supply.

Constant current operation helps to

prevent unwanted electrical noise

from being generated and conducted

or emitted to neighboring circuitry.

5. These optical power values are

measured as follows:

• The Beginning of Life (BOL) to the

End of Life (EOL) optical power

degradation is typically 1.5 dB per

the industry convention for long

wavelength LEDs. The actual

degradation observed in Hewlett-

Packard’s 1300 nm LED products is

< 1dB, as specified in this data

sheet.

• Over the specified operating

voltage and temperature ranges.

• With 25 MBd (12.5 MHz square-

wave), input signal.

• At the end of one meter of noted

optical fiber with cladding modes

removed.

The average power value can be

converted to a peak power value by

adding 3 dB. Higher output optical

power transmitters are available on

special request.

6. The Extinction Ratio is a measure of

the modulation depth of the optical

signal. The data “0” output optical

power is compared to the data “1”

peak output optical power and

expressed as a percentage. With the

transmitter driven by a 12.5 MHz

square-wave signal, the average

optical power is measured. The data

“1” peak power is then calculated by

adding 3 dB to the measured average

optical power. The data “0” output

optical power is found by measuring

the optical power when the transmit-

ter is driven by a logic “0” input. The

extinction ratio is the ratio of the

optical power at the “0” level

compared to the optical power at the

“1” level expressed as a percentage or

in decibels.

7. This parameter complies with the

requirements for the tradeoffs

between center wave length, spectral

width, and rise/fall times shown in

Figure 8.

8. The optical rise and fall times are

measured from 10% to 90% when the

transmitter is driven by a 25 MBd

(12.5 MHz square-wave) input signal.

This parameter complies with the

requirements for the tradeoffs

between center wavelength, spectral

width, and rise/fall times shown in

Figure 8.

9. Deterministic Jitter is defined as the

combination of Duty Cycle Distortion

and Data Dependent Jitter. Deter-

ministic Jitter is measured with a test

pattern consisting of repeating K28.5

(00111110101100000101) data

bytes and evaluated per the method in

FC-PH Annex A.4.3.

10. Random Jitter is specified with a

sequence of K28.7 (square wave of

alternating 5 ones and 5 zeros) data

bytes and, for the receiver, evaluated

at a Bit-Error-Ratio (BER) of 1 x 10-12

per the method in FC-PH Annex

A.4.4.

11. This specification is intended to

indicate the performance of the

receiver when Input Optical Power

signal characteristics are present per

the following definitions. The Input

Optical Power dynamic range from

the minimum level (with a window

time-width) to the maximum level is

the range over which the receiver is

guaranteed to provide output data

with a Bit-Error-Ratio (BER) better

than or equal to 1 x 10-12.

• At the Beginning of Life (BOL).

• Over the specified operation

temperature and voltage ranges.

• Input symbol pattern is a 266 MBd,

27 - 1 pseudo-random bit stream

data pattern.

• Receiver data window time-width is

± 0.94 ns or greater and centered

at mid-symbol. This data window

time width is calculated to simulate

the effect of worst-case input jitter

per FC-PH Annex J and clock

recovery sampling position in order

to insure good operation with the

various FC-0 receiver circuits.

• The maximum total jitter added by

the receiver and the maximum total

jitter presented to the clock

recovery circuit comply with the

maximum limits listed in Annex J,

but the allocations of the Rx added

jitter between deterministic jitter

and random jitter are different than

in Annex J.

12. All conditions of Note 11 apply

except that the measurement is made

at the center of the symbol with no

window time-width.

13. This value is measured during the

transition from low to high levels of

input optical power.

14. This value is measured during the

transition from high to low levels of

input optical power.

15. These values are measured with the

outputs terminated into 50 Ω con-

nected to VCC - 2 V and an input

optical power level of -14 dBm

average.

16. The power dissipation value is the

power dissipated in the transmitter or

the receiver itself. Power dissipation

is calculated as the sum of the

products of supply voltage and supply

current, minus the sum of the

products of the output voltages and

currents.

17. These values are measured with

respect to VCC with the output

terminated into 50 Ω connected to

VCC - 2 V.

18. The output rise and fall times are

measured between 20% and 80%

levels with the output connected to

VCC - 2 V through 50 Ω.

19. The Signal Detect output shall be

asserted, logic-high (VOH), within

100 µs after a step increase of the

Input Optical Power.

20. Signal Detect output shall be de-

asserted, logic-low (VOL), within

350 µs after a step decrease in the

Input Optical Power.

21. This value is measured with an output

load RL = 10 kΩ.

210

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